Piston-valve



D. V. BGUREAU.

PISTON VALVE.

I APPLICAUON FILED FEB. 26. i916. RENEWED MAY 13,1918. 1,358,514

Patented Nov. 9, 1920.`

SHEETS-SHEET l.

WMe/59% n. v. BOUREALL PISTON VALVE.

APPLICATION man rss. 26, 1916. nx-:NEwED MAY 13,1918.

1,358,514, Patented 1-Imf.9,1920.

2 SHEETS-SHEET 2.

ATTORNEY ENT EFIQE.

DESIR V. BOUREAU, 0F DETROIT, MICHIGAN.

. PISTON-VALVE.

Application filed February 26, 1916, Serial No. 80,736. Renewed May 13,1918.

To all whomy t may concern Be it known that l, Dnsiini V. BOUREAU, acitizen oi' the French `Republic, residing at Detroit, in the county oi'Wayne and State of lillichigan, have invented certain new and usefulImprovements in PistonvValves, of which the following is aspecilicatherein connecting said ports, and means to prevent the passageot gas from one port to the other around the piston valve.

Second, to provide, in a piston valve mechanism, means for equalizingthe pressure of compressed gas against the side of the piston valve.

Further objects, and objects relating to economies or' manufacture anddetails ot construction will definitely appear from the detaileddescription to follow.

kl accomplish the objects of my invention by the devices and meansdescribed in the following speciication. The invention is clearlydefined and pointed out in the claims. p

A structure constituting a preferred embodiment oit my invention isclearly illustrated in the accompanying drawings :torining part of thisspecification, in which:

Figure l is a vertical, sectional view through an engine cylinder,piston valve and valve casing showing the parts in the position theyoccupy when the intake port of the pre-compression chamber is beginningto open.

Fig. Il is a view, similar to Fig. I, showing the position of the partsas the engine piston approaches the upper limit of its stroke.

Fig. III isa vertical, sectional view on thesection line 3-3 of Fig. II.

Specification of Letters Fatent.

c Fatented N ov. 9, 1920.

serial No. 234,353.

Fig. 1V is a transverse, sectional view on the section line s-l oiL Fig.Ill.

Fig. V is a vertical, longitudinal view through an engine constructed inaccordance with my pending application, Number 67,313, and equipped withpiston valves constructedviii accordance with my invention.

Fig. V1 is a transverse, sectional view talren on the line 6 6 oi' F ig.1.

ln the drawings, similar reference characters refer to similar partsthroughout the several views, andthe sectional views are takenk lookingin the direction et the little arrows at the ends oi' the sectionallines.

w Considering the numbered parts of the drawing, the engine cylinder 5is or two diameters forming a lower, precompression chamber G and anupper combustion chainber 7. A two diameter piston works in saidcylinder having an upper piston head 8 working in the combustion chamber7 and a lower piston head 9 working in the precom-l pression chamber 6.rEhe piston is connected by connecting rod 10 with a suitablecrank-shaft, 30. il n Formed integral with the cylinder casing is acylindrical valve casingv 11 in which the piston valve l2 isreciprocable longitudinally. The rod 18 is connected bypin 14; to thelower end of said piston valve and the piston valve is reciprocatedthereby so as to open and close the ports at the proper points in thestroke oit the engine piston, the` rods 13 ofthe respective pistonvalves being connected to a counter cra-nh shaft 31 which l is driven bycrank shaft 30 'through the nected to an intake manifold. Passages 19"and 20 are provided extending through the piston valve 12 and sodisposed as torconnect ports 15 and 17 and ports 16 and 18 at certainpositions of the piston valve 12 relative to the casino' 11. The passage19 coin'- A b e) prises transverse portions 21 connected by alongitudinal portion 22 so that one end of iio the passage 19 is higherthan the other. Similarly the passage 20 comprises transverse portions23 connected by a longituc'linal portion 2s. rlhe piston valve 12carries a compression ring 25`above the upper end of passage 19, a pairof compression ringS 26 4between the ends of passage 19 and a pair ofcompression rings 2 between the' ends of'passage20. Anannular groove28encirclesy the valve 12 between the `compression rings 2T, said groovebeingso located that, as the engine piston approaches -theupper limit ofits stroke, said gro/ove is Yin :line withport 16. l

#In Fig. V, I Vhave shown anengine lofthe `V-type provided with sixcylinders A'in two blocks oic three cylinders each. The three cylinders`are connected together as sliown. 'ii-he lower vintakenports 18 ofthevalve casing are connected to an Vintake -manifold rEhe outlet ports 37of the, precompress'ion i chambers are connected to the fupper inta-kecombustion engine shown `in my patent ap-` plication, Serial Number67313, I use "apis- Aton valve having straight p'assages extend ingtransversely through Vthe valve 'iiston.l

In such -ra construction, lif the valve piston does'not lit Etightflyinthe casing, there is a ,possibility that gas might leak v4from `one partto the other by passing around the vvalve piston between it and Athewallof the valve casing.V Tofobviate suchka possibility, inthe presentconstruction I Vprovide compression rings on the piston valve so locatedthat they seal the cooperating ports from each other andvfpre'vent.a'loss of compression ,through leakage of the valve. rIh'e Vport18Yis'con`- nected with port 16 by passage 20. Thelpistonvalve 12carries 'the compression rings 27 between the-ends of the passage 2O andno one port to the other. Y

matter what position the piston valve -occupies, at least one of ltherings 27 will be between port 15 and port 18. to prevent the leakage ofgas from one `port to the other. Similarly the compression rings V26 arelocated between the ends of passage 19 which connects ports 15 'and 17and at least one of these rings 26 will always be between ports 15 and17 to prevent leakage of gasfroni When `the piston approaches the upperlimit of its stroke, the'compressed gas inithe pre-compression chamber 6exerts a pressure for "'uscin connection with the type of -internalcombustion engine which I have referred to. My invention 1s, however,not hrmted to use 1n this connection but can be used wherever'apiston:valve yis applicable f to' control the flow of ta fluid. I have shown areciprocating piston vvvalve but my invention would also be'applieabletoa'rot'ary valve in which 'the -rotation Tof Ethe valve brings thepassage in line with the ports.

I iam aware "that the particular embodiment of "my invention, which Iyhave here shown and described, Yis susceptible 'of considerablevariation withoutl departing 'from the lspiiit'of my invention, Aandtherefore, I do not wishlto be restricted to the specific structure lhere shown, except as required 'by the appended "'claiins.` I havefound, 'however, 574that J:this particular structure is very desirablefrom many jstandpoints, and there-V fore, I desire to claim thes'amespecifically,

as well asv bioadlyy'as findicatedbyfthe ap pended' claims.

Islavinfgthusdescribed my invention, what I claim as new and desire tosecure by Let-V ters Patent is:

1. Ina device of the "class described, 'the combination of` avalveicasingfprovided with a pair of inlet :ports and "a pair oi.Voutlet ports, said inlet `ports being jout fof aline- Inent with=1`said Aoutlet fp'or'ts,'a :piston valve reciprocable in said valvecasing andprovided 1'with "passages adaptedto connect said inletportswith said outlet ports at 'certain positions l"of said pistonvalve, one end of each of said passages being higherthanthe other, acompression ring carried Vby said piston valve above thefupperpassage, apair of 4'compressionfrings carriedby said piston valve between the endsofthe upper passage,

a second pair of compression rings carried bysaid-piston valvelbetweenthe ends of the lower passage, and an lannular groove formed in saidpiston valve between lthe second pair of rings. Y

2. In j'a de v-4vce of the class described, the combination of a valvecasing 'providedwith a pair -ofinlet ports and a .pair ofoutlet ports,said vinlet. ports being out 'of A1alinement ywith saidfoutletfp'orts, afpiston valveV reciprocable in said valve casing'and'prof videdwith-passages adapted -to connect said inlet portswith said outlet portsat certain positions of said .piston valve, one end of each of saidpassages being higher thanthe other, `and compression rings carried bysaid piston valves between the lower and upper adapted to connect saidports at a certain end of each of said passages. position of the pistonvalve, and an annular 10 3. In a device of the class described, thegroove formed in said piston valve so as to combination Qi a valvecasing, having inlet he brought into line With the port Communiandoutlet ports, one of said ports communieating With said chamber.

eating with a chamber in which a* fluid is In Witness whereof I havehereunto set my compressed7 a piston valve reciprocable in hand andseal.

said casing and provided with a passage DESIRE V. BOUREAU.

